hwc: Reset layer-to-rotator map and fences on configuration failure

When a rotator or mdp configuration for a display fails, reset the
layer-to-rotator mappings for that display and reset the release
fences for the rotator objects used for that display.

Note: The rotator itself is offline and not tied to any mixer. It is
from the mappings that we deduce which rotator object was used for
layers of which display. Also we don't delete rotator objects held
for a specific display, since during stability runs, failures could
repeat each round and we end up allocating and deallocating memory
unnecessarily. The rotator objects will be deleted automatically
when not required anymore.

Change-Id: I9a67f02574be30be3b96b3575f60530cb1c89e10
hwc: mdpcomp: Make all pipes available if a frame fails

Make all pipes in overlay available, if programming a frame (list)
fails. The failure could be due to commit failure, in which case the
overlay itself will make pipes available.

The failure can also be owing to lack of pipes, since we don't allow
switching pipes across mixers any more. This is particularly a problem
for split-panels. This fix addresses this latter case.

Change-Id: Ieac7ae7d03e5b9a93c7245fa160c8933593c2e09
hwc: Update rotator object handling in error cases

Earlier, on configuration errors, we simply drained the fences held
by current rotator objects and went to GPU comp. The rotator objects
were deleted in the subsequent rounds, if they remained unused.

If we don't use GPU comp on failure but use other strategies, then we
need to mark the rotator objects for a display for reuse, so that
other strategies can use them.

Also any failure resets on overlay or rotator need to happen from
functions that call configuration helpers rather than the  helper
themselves. Leaving cleanup to black-box helpers is not desirable.

Change-Id: I59b5b1bb774b82ee85a037e934c9d2d023db30af
hwc: remove displaying unused pipe in dump if set overlay fails

  If overlay set is failed, "pipe book is updated" with correct
  used state, but dump does not check the used state of the pipe
  and display the pipe info.

Change-Id: I6631311df30401f40efc5e626747d4fc4fcb64fe
Merge branch 'cm' into HEAD